pty.c revision 72786
1/* 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95 34 * $FreeBSD: head/sys/kern/tty_pty.c 72786 2001-02-21 06:39:57Z rwatson $ 35 */ 36 37/* 38 * Pseudo-teletype Driver 39 * (Actually two drivers, requiring two entries in 'cdevsw') 40 */ 41#include "opt_compat.h" 42#include <sys/param.h> 43#include <sys/systm.h> 44#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 45#include <sys/ioctl_compat.h> 46#endif 47#include <sys/proc.h> 48#include <sys/tty.h> 49#include <sys/conf.h> 50#include <sys/fcntl.h> 51#include <sys/poll.h> 52#include <sys/kernel.h> 53#include <sys/vnode.h> 54#include <sys/signalvar.h> 55#include <sys/malloc.h> 56 57static MALLOC_DEFINE(M_PTY, "ptys", "pty data structures"); 58 59static void ptsstart __P((struct tty *tp)); 60static void ptsstop __P((struct tty *tp, int rw)); 61static void ptcwakeup __P((struct tty *tp, int flag)); 62static dev_t ptyinit __P((int n)); 63 64static d_open_t ptsopen; 65static d_close_t ptsclose; 66static d_read_t ptsread; 67static d_write_t ptswrite; 68static d_ioctl_t ptyioctl; 69static d_open_t ptcopen; 70static d_close_t ptcclose; 71static d_read_t ptcread; 72static d_write_t ptcwrite; 73static d_poll_t ptcpoll; 74 75#define CDEV_MAJOR_S 5 76static struct cdevsw pts_cdevsw = { 77 /* open */ ptsopen, 78 /* close */ ptsclose, 79 /* read */ ptsread, 80 /* write */ ptswrite, 81 /* ioctl */ ptyioctl, 82 /* poll */ ttypoll, 83 /* mmap */ nommap, 84 /* strategy */ nostrategy, 85 /* name */ "pts", 86 /* maj */ CDEV_MAJOR_S, 87 /* dump */ nodump, 88 /* psize */ nopsize, 89 /* flags */ D_TTY | D_KQFILTER, 90 /* bmaj */ -1, 91 /* kqfilter */ ttykqfilter, 92}; 93 94#define CDEV_MAJOR_C 6 95static struct cdevsw ptc_cdevsw = { 96 /* open */ ptcopen, 97 /* close */ ptcclose, 98 /* read */ ptcread, 99 /* write */ ptcwrite, 100 /* ioctl */ ptyioctl, 101 /* poll */ ptcpoll, 102 /* mmap */ nommap, 103 /* strategy */ nostrategy, 104 /* name */ "ptc", 105 /* maj */ CDEV_MAJOR_C, 106 /* dump */ nodump, 107 /* psize */ nopsize, 108 /* flags */ D_TTY | D_KQFILTER, 109 /* bmaj */ -1, 110 /* kqfilter */ ttykqfilter, 111}; 112 113#define BUFSIZ 100 /* Chunk size iomoved to/from user */ 114 115struct pt_ioctl { 116 int pt_flags; 117 struct selinfo pt_selr, pt_selw; 118 u_char pt_send; 119 u_char pt_ucntl; 120 struct tty pt_tty; 121 dev_t devs, devc; 122 struct prison *pt_prison; 123}; 124 125#define PF_PKT 0x08 /* packet mode */ 126#define PF_STOPPED 0x10 /* user told stopped */ 127#define PF_REMOTE 0x20 /* remote and flow controlled input */ 128#define PF_NOSTOP 0x40 129#define PF_UCNTL 0x80 /* user control mode */ 130 131/* 132 * This function creates and initializes a pts/ptc pair 133 * 134 * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 135 * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 136 * 137 * XXX: define and add mapping of upper minor bits to allow more 138 * than 256 ptys. 139 */ 140static dev_t 141ptyinit(n) 142 int n; 143{ 144 dev_t devs, devc; 145 char *names = "pqrsPQRS"; 146 struct pt_ioctl *pt; 147 148 /* For now we only map the lower 8 bits of the minor */ 149 if (n & ~0xff) 150 return (NODEV); 151 152 pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); 153 pt->devs = devs = make_dev(&pts_cdevsw, n, 154 UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32); 155 pt->devc = devc = make_dev(&ptc_cdevsw, n, 156 UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[n / 32], n % 32); 157 158 devs->si_drv1 = devc->si_drv1 = pt; 159 devs->si_tty = devc->si_tty = &pt->pt_tty; 160 ttyregister(&pt->pt_tty); 161 return (devc); 162} 163 164/*ARGSUSED*/ 165static int 166ptsopen(dev, flag, devtype, p) 167 dev_t dev; 168 int flag, devtype; 169 struct proc *p; 170{ 171 register struct tty *tp; 172 int error; 173 struct pt_ioctl *pti; 174 175 if (!dev->si_drv1) 176 ptyinit(minor(dev)); 177 if (!dev->si_drv1) 178 return(ENXIO); 179 pti = dev->si_drv1; 180 tp = dev->si_tty; 181 if ((tp->t_state & TS_ISOPEN) == 0) { 182 ttychars(tp); /* Set up default chars */ 183 tp->t_iflag = TTYDEF_IFLAG; 184 tp->t_oflag = TTYDEF_OFLAG; 185 tp->t_lflag = TTYDEF_LFLAG; 186 tp->t_cflag = TTYDEF_CFLAG; 187 tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 188 } else if (tp->t_state & TS_XCLUDE && suser(p)) { 189 return (EBUSY); 190 } else if (pti->pt_prison != p->p_ucred->cr_prison) { 191 return (EBUSY); 192 } 193 if (tp->t_oproc) /* Ctrlr still around. */ 194 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 195 while ((tp->t_state & TS_CARR_ON) == 0) { 196 if (flag&FNONBLOCK) 197 break; 198 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 199 "ptsopn", 0); 200 if (error) 201 return (error); 202 } 203 error = (*linesw[tp->t_line].l_open)(dev, tp); 204 if (error == 0) 205 ptcwakeup(tp, FREAD|FWRITE); 206 return (error); 207} 208 209static int 210ptsclose(dev, flag, mode, p) 211 dev_t dev; 212 int flag, mode; 213 struct proc *p; 214{ 215 register struct tty *tp; 216 int err; 217 218 tp = dev->si_tty; 219 err = (*linesw[tp->t_line].l_close)(tp, flag); 220 ptsstop(tp, FREAD|FWRITE); 221 (void) ttyclose(tp); 222 return (err); 223} 224 225static int 226ptsread(dev, uio, flag) 227 dev_t dev; 228 struct uio *uio; 229 int flag; 230{ 231 struct proc *p = curproc; 232 register struct tty *tp = dev->si_tty; 233 register struct pt_ioctl *pti = dev->si_drv1; 234 int error = 0; 235 236again: 237 if (pti->pt_flags & PF_REMOTE) { 238 while (isbackground(p, tp)) { 239 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) || 240 SIGISMEMBER(p->p_sigmask, SIGTTIN) || 241 p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) 242 return (EIO); 243 pgsignal(p->p_pgrp, SIGTTIN, 1); 244 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 245 0); 246 if (error) 247 return (error); 248 } 249 if (tp->t_canq.c_cc == 0) { 250 if (flag & IO_NDELAY) 251 return (EWOULDBLOCK); 252 error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 253 "ptsin", 0); 254 if (error) 255 return (error); 256 goto again; 257 } 258 while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 259 if (ureadc(getc(&tp->t_canq), uio) < 0) { 260 error = EFAULT; 261 break; 262 } 263 if (tp->t_canq.c_cc == 1) 264 (void) getc(&tp->t_canq); 265 if (tp->t_canq.c_cc) 266 return (error); 267 } else 268 if (tp->t_oproc) 269 error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 270 ptcwakeup(tp, FWRITE); 271 return (error); 272} 273 274/* 275 * Write to pseudo-tty. 276 * Wakeups of controlling tty will happen 277 * indirectly, when tty driver calls ptsstart. 278 */ 279static int 280ptswrite(dev, uio, flag) 281 dev_t dev; 282 struct uio *uio; 283 int flag; 284{ 285 register struct tty *tp; 286 287 tp = dev->si_tty; 288 if (tp->t_oproc == 0) 289 return (EIO); 290 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 291} 292 293/* 294 * Start output on pseudo-tty. 295 * Wake up process selecting or sleeping for input from controlling tty. 296 */ 297static void 298ptsstart(tp) 299 struct tty *tp; 300{ 301 register struct pt_ioctl *pti = tp->t_dev->si_drv1; 302 303 if (tp->t_state & TS_TTSTOP) 304 return; 305 if (pti->pt_flags & PF_STOPPED) { 306 pti->pt_flags &= ~PF_STOPPED; 307 pti->pt_send = TIOCPKT_START; 308 } 309 ptcwakeup(tp, FREAD); 310} 311 312static void 313ptcwakeup(tp, flag) 314 struct tty *tp; 315 int flag; 316{ 317 struct pt_ioctl *pti = tp->t_dev->si_drv1; 318 319 if (flag & FREAD) { 320 selwakeup(&pti->pt_selr); 321 wakeup(TSA_PTC_READ(tp)); 322 } 323 if (flag & FWRITE) { 324 selwakeup(&pti->pt_selw); 325 wakeup(TSA_PTC_WRITE(tp)); 326 } 327} 328 329static int 330ptcopen(dev, flag, devtype, p) 331 dev_t dev; 332 int flag, devtype; 333 struct proc *p; 334{ 335 register struct tty *tp; 336 struct pt_ioctl *pti; 337 338 if (!dev->si_drv1) 339 ptyinit(minor(dev)); 340 if (!dev->si_drv1) 341 return(ENXIO); 342 tp = dev->si_tty; 343 if (tp->t_oproc) 344 return (EIO); 345 tp->t_timeout = -1; 346 tp->t_oproc = ptsstart; 347 tp->t_stop = ptsstop; 348 (void)(*linesw[tp->t_line].l_modem)(tp, 1); 349 tp->t_lflag &= ~EXTPROC; 350 pti = dev->si_drv1; 351 pti->pt_prison = p->p_ucred->cr_prison; 352 pti->pt_flags = 0; 353 pti->pt_send = 0; 354 pti->pt_ucntl = 0; 355 return (0); 356} 357 358static int 359ptcclose(dev, flags, fmt, p) 360 dev_t dev; 361 int flags; 362 int fmt; 363 struct proc *p; 364{ 365 register struct tty *tp; 366 367 tp = dev->si_tty; 368 (void)(*linesw[tp->t_line].l_modem)(tp, 0); 369 370 /* 371 * XXX MDMBUF makes no sense for ptys but would inhibit the above 372 * l_modem(). CLOCAL makes sense but isn't supported. Special 373 * l_modem()s that ignore carrier drop make no sense for ptys but 374 * may be in use because other parts of the line discipline make 375 * sense for ptys. Recover by doing everything that a normal 376 * ttymodem() would have done except for sending a SIGHUP. 377 */ 378 if (tp->t_state & TS_ISOPEN) { 379 tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 380 tp->t_state |= TS_ZOMBIE; 381 ttyflush(tp, FREAD | FWRITE); 382 } 383 384 tp->t_oproc = 0; /* mark closed */ 385 return (0); 386} 387 388static int 389ptcread(dev, uio, flag) 390 dev_t dev; 391 struct uio *uio; 392 int flag; 393{ 394 register struct tty *tp = dev->si_tty; 395 struct pt_ioctl *pti = dev->si_drv1; 396 char buf[BUFSIZ]; 397 int error = 0, cc; 398 399 /* 400 * We want to block until the slave 401 * is open, and there's something to read; 402 * but if we lost the slave or we're NBIO, 403 * then return the appropriate error instead. 404 */ 405 for (;;) { 406 if (tp->t_state&TS_ISOPEN) { 407 if (pti->pt_flags&PF_PKT && pti->pt_send) { 408 error = ureadc((int)pti->pt_send, uio); 409 if (error) 410 return (error); 411 if (pti->pt_send & TIOCPKT_IOCTL) { 412 cc = min(uio->uio_resid, 413 sizeof(tp->t_termios)); 414 uiomove((caddr_t)&tp->t_termios, cc, 415 uio); 416 } 417 pti->pt_send = 0; 418 return (0); 419 } 420 if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 421 error = ureadc((int)pti->pt_ucntl, uio); 422 if (error) 423 return (error); 424 pti->pt_ucntl = 0; 425 return (0); 426 } 427 if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 428 break; 429 } 430 if ((tp->t_state & TS_CONNECTED) == 0) 431 return (0); /* EOF */ 432 if (flag & IO_NDELAY) 433 return (EWOULDBLOCK); 434 error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 435 if (error) 436 return (error); 437 } 438 if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 439 error = ureadc(0, uio); 440 while (uio->uio_resid > 0 && error == 0) { 441 cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 442 if (cc <= 0) 443 break; 444 error = uiomove(buf, cc, uio); 445 } 446 ttwwakeup(tp); 447 return (error); 448} 449 450static void 451ptsstop(tp, flush) 452 register struct tty *tp; 453 int flush; 454{ 455 struct pt_ioctl *pti = tp->t_dev->si_drv1; 456 int flag; 457 458 /* note: FLUSHREAD and FLUSHWRITE already ok */ 459 if (flush == 0) { 460 flush = TIOCPKT_STOP; 461 pti->pt_flags |= PF_STOPPED; 462 } else 463 pti->pt_flags &= ~PF_STOPPED; 464 pti->pt_send |= flush; 465 /* change of perspective */ 466 flag = 0; 467 if (flush & FREAD) 468 flag |= FWRITE; 469 if (flush & FWRITE) 470 flag |= FREAD; 471 ptcwakeup(tp, flag); 472} 473 474static int 475ptcpoll(dev, events, p) 476 dev_t dev; 477 int events; 478 struct proc *p; 479{ 480 register struct tty *tp = dev->si_tty; 481 struct pt_ioctl *pti = dev->si_drv1; 482 int revents = 0; 483 int s; 484 485 if ((tp->t_state & TS_CONNECTED) == 0) 486 return (seltrue(dev, events, p) | POLLHUP); 487 488 /* 489 * Need to block timeouts (ttrstart). 490 */ 491 s = spltty(); 492 493 if (events & (POLLIN | POLLRDNORM)) 494 if ((tp->t_state & TS_ISOPEN) && 495 ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 496 ((pti->pt_flags & PF_PKT) && pti->pt_send) || 497 ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 498 revents |= events & (POLLIN | POLLRDNORM); 499 500 if (events & (POLLOUT | POLLWRNORM)) 501 if (tp->t_state & TS_ISOPEN && 502 ((pti->pt_flags & PF_REMOTE) ? 503 (tp->t_canq.c_cc == 0) : 504 ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 505 (tp->t_canq.c_cc == 0 && (tp->t_iflag & ICANON))))) 506 revents |= events & (POLLOUT | POLLWRNORM); 507 508 if (events & POLLHUP) 509 if ((tp->t_state & TS_CARR_ON) == 0) 510 revents |= POLLHUP; 511 512 if (revents == 0) { 513 if (events & (POLLIN | POLLRDNORM)) 514 selrecord(p, &pti->pt_selr); 515 516 if (events & (POLLOUT | POLLWRNORM)) 517 selrecord(p, &pti->pt_selw); 518 } 519 splx(s); 520 521 return (revents); 522} 523 524static int 525ptcwrite(dev, uio, flag) 526 dev_t dev; 527 register struct uio *uio; 528 int flag; 529{ 530 register struct tty *tp = dev->si_tty; 531 register u_char *cp = 0; 532 register int cc = 0; 533 u_char locbuf[BUFSIZ]; 534 int cnt = 0; 535 struct pt_ioctl *pti = dev->si_drv1; 536 int error = 0; 537 538again: 539 if ((tp->t_state&TS_ISOPEN) == 0) 540 goto block; 541 if (pti->pt_flags & PF_REMOTE) { 542 if (tp->t_canq.c_cc) 543 goto block; 544 while ((uio->uio_resid > 0 || cc > 0) && 545 tp->t_canq.c_cc < TTYHOG - 1) { 546 if (cc == 0) { 547 cc = min(uio->uio_resid, BUFSIZ); 548 cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 549 cp = locbuf; 550 error = uiomove((caddr_t)cp, cc, uio); 551 if (error) 552 return (error); 553 /* check again for safety */ 554 if ((tp->t_state & TS_ISOPEN) == 0) { 555 /* adjust as usual */ 556 uio->uio_resid += cc; 557 return (EIO); 558 } 559 } 560 if (cc > 0) { 561 cc = b_to_q((char *)cp, cc, &tp->t_canq); 562 /* 563 * XXX we don't guarantee that the canq size 564 * is >= TTYHOG, so the above b_to_q() may 565 * leave some bytes uncopied. However, space 566 * is guaranteed for the null terminator if 567 * we don't fail here since (TTYHOG - 1) is 568 * not a multiple of CBSIZE. 569 */ 570 if (cc > 0) 571 break; 572 } 573 } 574 /* adjust for data copied in but not written */ 575 uio->uio_resid += cc; 576 (void) putc(0, &tp->t_canq); 577 ttwakeup(tp); 578 wakeup(TSA_PTS_READ(tp)); 579 return (0); 580 } 581 while (uio->uio_resid > 0 || cc > 0) { 582 if (cc == 0) { 583 cc = min(uio->uio_resid, BUFSIZ); 584 cp = locbuf; 585 error = uiomove((caddr_t)cp, cc, uio); 586 if (error) 587 return (error); 588 /* check again for safety */ 589 if ((tp->t_state & TS_ISOPEN) == 0) { 590 /* adjust for data copied in but not written */ 591 uio->uio_resid += cc; 592 return (EIO); 593 } 594 } 595 while (cc > 0) { 596 if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 597 (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 598 wakeup(TSA_HUP_OR_INPUT(tp)); 599 goto block; 600 } 601 (*linesw[tp->t_line].l_rint)(*cp++, tp); 602 cnt++; 603 cc--; 604 } 605 cc = 0; 606 } 607 return (0); 608block: 609 /* 610 * Come here to wait for slave to open, for space 611 * in outq, or space in rawq, or an empty canq. 612 */ 613 if ((tp->t_state & TS_CONNECTED) == 0) { 614 /* adjust for data copied in but not written */ 615 uio->uio_resid += cc; 616 return (EIO); 617 } 618 if (flag & IO_NDELAY) { 619 /* adjust for data copied in but not written */ 620 uio->uio_resid += cc; 621 if (cnt == 0) 622 return (EWOULDBLOCK); 623 return (0); 624 } 625 error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 626 if (error) { 627 /* adjust for data copied in but not written */ 628 uio->uio_resid += cc; 629 return (error); 630 } 631 goto again; 632} 633 634/*ARGSUSED*/ 635static int 636ptyioctl(dev, cmd, data, flag, p) 637 dev_t dev; 638 u_long cmd; 639 caddr_t data; 640 int flag; 641 struct proc *p; 642{ 643 register struct tty *tp = dev->si_tty; 644 register struct pt_ioctl *pti = dev->si_drv1; 645 register u_char *cc = tp->t_cc; 646 int stop, error; 647 648 if (devsw(dev)->d_open == ptcopen) { 649 switch (cmd) { 650 651 case TIOCGPGRP: 652 /* 653 * We avoid calling ttioctl on the controller since, 654 * in that case, tp must be the controlling terminal. 655 */ 656 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 657 return (0); 658 659 case TIOCPKT: 660 if (*(int *)data) { 661 if (pti->pt_flags & PF_UCNTL) 662 return (EINVAL); 663 pti->pt_flags |= PF_PKT; 664 } else 665 pti->pt_flags &= ~PF_PKT; 666 return (0); 667 668 case TIOCUCNTL: 669 if (*(int *)data) { 670 if (pti->pt_flags & PF_PKT) 671 return (EINVAL); 672 pti->pt_flags |= PF_UCNTL; 673 } else 674 pti->pt_flags &= ~PF_UCNTL; 675 return (0); 676 677 case TIOCREMOTE: 678 if (*(int *)data) 679 pti->pt_flags |= PF_REMOTE; 680 else 681 pti->pt_flags &= ~PF_REMOTE; 682 ttyflush(tp, FREAD|FWRITE); 683 return (0); 684 } 685 686 /* 687 * The rest of the ioctls shouldn't be called until 688 * the slave is open. 689 */ 690 if ((tp->t_state & TS_ISOPEN) == 0) 691 return (EAGAIN); 692 693 switch (cmd) { 694#ifdef COMPAT_43 695 case TIOCSETP: 696 case TIOCSETN: 697#endif 698 case TIOCSETD: 699 case TIOCSETA: 700 case TIOCSETAW: 701 case TIOCSETAF: 702 /* 703 * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 704 * ttywflush(tp) will hang if there are characters in 705 * the outq. 706 */ 707 ndflush(&tp->t_outq, tp->t_outq.c_cc); 708 break; 709 710 case TIOCSIG: 711 if (*(unsigned int *)data >= NSIG || 712 *(unsigned int *)data == 0) 713 return(EINVAL); 714 if ((tp->t_lflag&NOFLSH) == 0) 715 ttyflush(tp, FREAD|FWRITE); 716 pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 717 if ((*(unsigned int *)data == SIGINFO) && 718 ((tp->t_lflag&NOKERNINFO) == 0)) 719 ttyinfo(tp); 720 return(0); 721 } 722 } 723 if (cmd == TIOCEXT) { 724 /* 725 * When the EXTPROC bit is being toggled, we need 726 * to send an TIOCPKT_IOCTL if the packet driver 727 * is turned on. 728 */ 729 if (*(int *)data) { 730 if (pti->pt_flags & PF_PKT) { 731 pti->pt_send |= TIOCPKT_IOCTL; 732 ptcwakeup(tp, FREAD); 733 } 734 tp->t_lflag |= EXTPROC; 735 } else { 736 if ((tp->t_lflag & EXTPROC) && 737 (pti->pt_flags & PF_PKT)) { 738 pti->pt_send |= TIOCPKT_IOCTL; 739 ptcwakeup(tp, FREAD); 740 } 741 tp->t_lflag &= ~EXTPROC; 742 } 743 return(0); 744 } 745 error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 746 if (error == ENOIOCTL) 747 error = ttioctl(tp, cmd, data, flag); 748 if (error == ENOIOCTL) { 749 if (pti->pt_flags & PF_UCNTL && 750 (cmd & ~0xff) == UIOCCMD(0)) { 751 if (cmd & 0xff) { 752 pti->pt_ucntl = (u_char)cmd; 753 ptcwakeup(tp, FREAD); 754 } 755 return (0); 756 } 757 error = ENOTTY; 758 } 759 /* 760 * If external processing and packet mode send ioctl packet. 761 */ 762 if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 763 switch(cmd) { 764 case TIOCSETA: 765 case TIOCSETAW: 766 case TIOCSETAF: 767#ifdef COMPAT_43 768 case TIOCSETP: 769 case TIOCSETN: 770#endif 771#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 772 case TIOCSETC: 773 case TIOCSLTC: 774 case TIOCLBIS: 775 case TIOCLBIC: 776 case TIOCLSET: 777#endif 778 pti->pt_send |= TIOCPKT_IOCTL; 779 ptcwakeup(tp, FREAD); 780 default: 781 break; 782 } 783 } 784 stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 785 && CCEQ(cc[VSTART], CTRL('q')); 786 if (pti->pt_flags & PF_NOSTOP) { 787 if (stop) { 788 pti->pt_send &= ~TIOCPKT_NOSTOP; 789 pti->pt_send |= TIOCPKT_DOSTOP; 790 pti->pt_flags &= ~PF_NOSTOP; 791 ptcwakeup(tp, FREAD); 792 } 793 } else { 794 if (!stop) { 795 pti->pt_send &= ~TIOCPKT_DOSTOP; 796 pti->pt_send |= TIOCPKT_NOSTOP; 797 pti->pt_flags |= PF_NOSTOP; 798 ptcwakeup(tp, FREAD); 799 } 800 } 801 return (error); 802} 803 804 805static void ptc_drvinit __P((void *unused)); 806 807static void pty_clone __P((void *arg, char *name, int namelen, dev_t *dev)); 808 809static void 810pty_clone(arg, name, namelen, dev) 811 void *arg; 812 char *name; 813 int namelen; 814 dev_t *dev; 815{ 816 int u; 817 818 if (*dev != NODEV) 819 return; 820 if (bcmp(name, "pty", 3) != 0) 821 return; 822 if (name[5] != '\0') 823 return; 824 switch (name[3]) { 825 case 'p': u = 0; break; 826 case 'q': u = 32; break; 827 case 'r': u = 64; break; 828 case 's': u = 96; break; 829 case 'P': u = 128; break; 830 case 'Q': u = 160; break; 831 case 'R': u = 192; break; 832 case 'S': u = 224; break; 833 default: return; 834 } 835 if (name[4] >= '0' && name[4] <= '9') 836 u += name[4] - '0'; 837 else if (name[4] >= 'a' && name[4] <= 'v') 838 u += name[4] - 'a' + 10; 839 else 840 return; 841 *dev = ptyinit(u); 842 return; 843} 844 845static void 846ptc_drvinit(unused) 847 void *unused; 848{ 849 EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000); 850 cdevsw_add(&pts_cdevsw); 851 cdevsw_add(&ptc_cdevsw); 852} 853 854SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 855